Gun-barrel and process of producing the same.



R. H. BERKSTRESSER. GUN BARREL AND PROCESS OF PRODUCING THE SAME.

APPLICATION FILED MAR. 19,1906

Patented Aug. 10, 1909.

anvzntoz awmzvv @hgm- 72% @fm I Witness ROBERT H. BERKSTRESSER, OF.Y( RK, PENNSYLVANTA.

GUN-BARREL AND PROCESS OF PRODUCING THE- SAME.

Specification of Letters Patent.

Patented Aug. 10, 1909.

. Application filed March 19, 1906. Serial No. 306,807.

: To all whom it may concern:'

Be it known that 1, ROBERT H. BERK- srunssnn, citizen of the United States, residing at York, in the county of York and State of Pennsylvania, have invented certain new and useful Improvements in Gun-Barrels and Processes of Producing Same, of which the following is a specification.

My invention relates to ordnance and a more particularly to gun barrels; and it consists in a process of cheaply and expedi tious'ly producing a gun barrel having a rust-proof lining calculated to withstand exposure and wear and materially prolong the usefulness of the gun-barrel as a whole.

\Vith the foregoing in view, the invention will be fully understood from the following description and claim when the same are considered in connection with the accompanymg drawings, forming part'of this specification, in which: i

Figure l is a longitudinal, diametrical section of so much of the barrel-of a piece of ordnance as is necessary to illustrate the present-and preferred embodiment of m in-. vention; Fig. 2, a transverse section 0 the same, taken in the plane indicated by the broken line 22 of Fig. 1; and Fig. 3, a degiil view illustrating a portion of the lining tube as the same appears subsequent/to being tinned and precedent to being secured in the outer tubular body of the barrel in accordance with my invention.

Similar letters designate corresponding parts in all of the views ,of the drawings, referring to which:

A is the outer tubular body of a barrel which may be and preferably is the barrel of a piece of ordnance, though I desire it distinctly understood that when deemed expedient my invention may be employed in the barrels of shoulder guns and other firearms. The said outer tubular body A is of steel, and may be made in the manner well known in the art or in any 'other manner compatible with my invention without involving departure from the scope of the same. V

B is the tubular lining of the barrel, and C is the coating of tin applied to the outer side. of the said tubular lining and having) for its purpose to join the outer tubular ody A and the lining tube B and securely fix the latter in the former in the manner hereinafter pointed out in detail. The tubular lin-. ing B is of brass, German-silver, phosphorbronze or other'metal that is rust-proof and at the same time possessed of good wearing capacity; and it may be rifled or not in the discretion of the manufacturer; also, when the rifling is resorted to, it may be accomplished either before or after the lining tube is placed in and joined'to the outer tubular body. The coating of tin C which entirely covers the outer side of the lining tube 13 and is of even thickness throughout, as shown, may be applied in the ordinary manner resorted to in the deposition of tin or may be applied in any other manner compatible with my invention without affecting the scopeof the same.

In practicing my novel process and pro duclng my improved glm barrel,'I first appgly the tin' coating C to the tubular lining and then after the tin is set, introduce the coated tubular lining into the outer tubular body A. Incident to this latter step it will be apparent that the tin coating G, of even thickness throughout, will position the lining tube B centrally in the outer tubular body A; also, that the said tin coating will render easy the operation of driving the tubular lining home in the tubular body.

Subsequent to the insertion of the tubular lining in the tubular body sufficient heat is applied externally to the tubular body to fuse the. outer portion of the tin coating C, when, as will be readily appreciated, the said coating will. strongly join the tubular lining to the outer tubular body and hold the former in correct position in the latter. The fusing of the outer portion only of the coating is important, inasmuch as if the whole coating were made molten or soft, the tubular lining could become readily displaced laterally in the tubular body, thus resnlting in an inaccurate and defective product, as will be evident.

I prefer to coatthe tubular linlng B with tin because of the facility with which such material may be a plied and subsequently fused to join the to g tubular body. I do not desire, however, to be understood as confining myself to a coating of tin inasmuch as a coating of any other material adapted to be deposited on the tubular lining, and susceptiblewf being subsequently fused to join the tubular lining to the outer tubular body may be employed without involving departure from the scope of my invention.

It will be gathered from the foregoing ular linin to the outer that my improved barrel is but little more expensive than an ordinary gun barrel, and yet is adapted to withstand a great amount of usage and is not liable to be rusted or corroded by moisture collected in its bore. This latter will be appreciated as an important advantage when it is remembered that it is frequently necessary to use guns in the vicinity of water where the air is always laden with more ,or less moisture.

Having described my invention, what I claim and desire to secure by Letters Patent, is I The process described, which consists in taking a steel tube, taking a lining tube of rust-proof metal, the exterior diameter of which is less than the interior diameter of the steel tube, applying to the said lining tube an external coating of tin of even thickness throughout and corresponding in thickness to the diiference between the interior diameter of the steel tube and the exterior diameter of the lining tube, driving v the coated lining tube, subsequent to the setting of the coating, into the steel tube, whereby the lining tube is concentrically positioned in said steel tube, and applying heat externally t0 the steel tube suflicient to fuse the outer portion of the tin coating While leaving the remainder set or solid to cause said outer portion to join the steel tube While retaining the lining tube in its concentric position.

In testlmony Whereof I aflix my signature in presence of two Witnesses.

ROBERT H. BERKSTRESSER. 

